Albin gaeeett and eufus thomas



(No Model.)

A. GARRETT & R. THOMAS.

Trimming Attachment for'sewing Machines.

No. 242,296. Patented May 31,1881.-

1 Y FIG 1,

UNTTED STATES PATENT OEErcE.

ALBIN GARRETT AND RUFUS THOMAS, F PHILADELPHIA, PENNSYLVANIA, ASSIGNORSTO THE NATIONAL SEWING MACHINE COMPANY, (LIMITED,)

OF SAME PLACE.

TRIMMING ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 242,296, dated May 31,1881.

Application filed November 22, 1880.

To all whom t't may concern Be it known that we, ALBIN GARRETT and BurnsTHOMAS, citizens of the United States, residing in Philadelphia,Pennsylvania, have invented certain Improvements in Sewing-MachineAttachments, of which the following is a specification.

Our invention relates to improvements in the shears connected withsewing-machines for the purpose of trimming the edges of the fabricsimultaneously with the stitching of the same; and the objects of ourimprovements are, first, to afford facilities for the accurateadjustment'of the vibrating blade ofthe shears, I 5 and, second, toallow the fabric to pass freely onto the cutting-edge of the lowerblade.

In the accompanying drawings, Figure l is a plan view of asewing-machine from which part of the structure has been removed toillustrate our invention; Fig. 2, a perspective view of the shears anddevices through the medium of which one of the blades is operated from acrank-pin on the driving-wheel of the machine; Fig. 3, a transversesection on the 2 5 line 1 2, Fig. 1; Fig. 4, a detached perspective viewof the fixed blade of the shears; Fig. 5, a view of the pivot for theupper blade; Fig. 6, a detached view of the recessed work-plate, drawnto an enlarged scale; and Fig. 7, a sec- 0 tional view, also enlarged,and showing the relation of the fixed blade of the shears to saidrecessed work-plate.

As far as the sewing-machine itself is concerned, it maybe similar to anyof the machines 3 5 in common use, and is provided with the usualneedle-bar, presser-foot, and feed mechanism.

To the bed-plate A of the machine is secured a plate, G, madelongitudinally and laterally adjustable, preferably by elongated slots,

through which set-screws less in diameter than the width of the slotpass into the bed-plate.

From the adjustable plate G projects the lower blade, 71, of the shears,the upper blade consisting of the short arm '1; of a lever, H,

which is pivoted at w to the plate G, and the long arm of which has aslot to receive and guide the sliding blockF, through which passes aportion of the pin K, Fig. 5, the other portion of the pin passingthrough an elongated (No model.)

slot in an arm, M, and being secured thereto by a nut, so that the pincan be adjusted on the arm to any extent which the desired position ofthe upper blade of the shears may demand. The arm M is secured to oneend of a shaft, N, which has its bearings in suitable boxes or lugs onthe under side of the bedplate A, and on the opposite end of the shaftis an arm, P,connected, by a link,T, to a crankpin, 10, on thedriving-wheel of thesewingmachine. The lever H is comparatively loose onits pivot, and a spiral spring, (I, on the portion m of the pin K has acontinuous tendency to force the long arm of the lever H outward in thedirection of the arrow, Fig. 1, and to press the upper blade of theshears against the fixed blade at and near the point, thereby insuringthe efficient shearing action of the two blades.

The cutting-edges of the blades are in such a position in respect to theneedle and the needle-hole in the work-plate that as the fabric is beingstitched and fed its edges will be properly trimmed ,the distance fromthe stitches to where the trimming takes ett'ect on the fabric beingregulated by the adjustment of the plate G on the bed of the machine.

On referring to Figs. 6 and 7 it will be seen that the work-plate S isrecessed at u, so as to form a shoulder, 'l ,the lower blade of theshears resting in this recess, and the point of the blade bearingagainst the shoulder, Fig. 7. This arrangement allows the fabric to passfreely onto the cutting-edge of the lower blade, and permits theformation on this blade of a comparatively blunt point, on which thefabric cannot catch. By this means we are enabled to trim much closer tothe seam than can otherwise be doue, and the upper blade of the shearsis at liberty to pass the lower blade up to the extreme point of thelatter without coming into contact with the work-plate. The upper bladeshould admit of very nice adjustment, so that the shears may exert theproper cutting effect to the extreme point, and this adjustment can bereadily cfi'ected by shifting the pin K in the slot of the arm H.

We claim as our invention- 1. The combination of the fixed blade of theshears, the upper blade forming part of the lever H, the sliding blockF, adapted to guides in the lever, the vibrating slotted arm M, and thepin K, made adjustable in the said arm and adapted to the sliding block,all substantially as set forth.

2. The combination of the lower fixed blade of the shears with awork-plate, S, having a recess, v, adapted to the said blade andterminating in a shoulder, y, against which the end of the blade abuts,all as set forth.

3. lhe combination of the lower blade of the shears, having a blunt end,with the work-'

